Optical element driving device and imaging apparatus

ABSTRACT

A lens driving device includes a lens, a moving member that supports the lens, a stationary member that movably supports the moving member, a pitch drive mechanism that drives the moving member in the pitch correction direction, and a yaw drive mechanism that drives in the yaw correction direction. The pitch drive mechanism has first and second magnets provided to the stationary member, and first and second coils provided to the moving member. The yaw drive mechanism has a third magnet provided to the stationary member, and a third coil provided to the moving member. The first and second coils are arranged on opposite sides of the lens when viewed in a third direction that is perpendicular to the pitch and yaw correction directions, and the third coil is arranged on the same side as the first coil with respect to the lens when viewed in the third direction.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Japanese Patent Application No. JP2007-298546 filed on Nov. 16, 2007. The entire disclosure of JapanesePatent Application No. JP 2007-298546 is hereby incorporated herein byreference.

BACKGROUND

1. Technical Field

The technical field relates to an optical element driving device fordriving an optical element of an imaging apparatus, and to an imagingapparatus in which this device is used.

2. Description of the Related Art

Recent years have witnessed the practical application of products suchas digital imaging apparatus, typified by digital still cameras anddigital video cameras, which are equipped with image blur correctionmechanisms that correct image blur caused by hand shake in the pitch andyaw directions of the apparatus during image capture. With most imageblur correction mechanisms, image blur is corrected by using a lensdriving device (an example of an optical element driving device) todrive part of the imaging optical system in two directions, namely, apitch correction direction and a yaw correction direction that areperpendicular to the optical axis.

Furthermore, lens driving devices for correcting image blur areincreasingly being installed in imaging apparatus that make use of abending optical system including prisms, mirrors, and so forth.

An advantage of an imaging apparatus equipped with a bending opticalsystem is that the camera main body can be thinner. Accordingly, thelens driving device for correcting image blur also needs to be thinnerin the thickness direction of the camera main body, which isaccomplished, for example, by disposing the linear actuator or otherdrive unit on one or both sides with respect to the lens. For instance,imaging apparatus are known in the past in which the drive unit isprovided on one or both sides of the lens and the camera main body ismade thinner in its thickness direction, as disclosed in JapaneseLaid-Open Patent Applications 2006-243704, 2007-17957, and 2000-194027.

With the lens driving device disclosed in Japanese Laid-Open PatentApplication 2006-243704, two drive units for driving in the pitch andyaw correction directions are provided on one side in the yaw correctiondirection of a circular lens (an optical element), and disposed to bespaced apart vertically. The elliptical coil and magnets that constitutethe drive units are disposed above and below on one side of the lens.The coils are disposed such that they are wound around an axisperpendicular to the optical axis.

With the lens driving device disclosed in Japanese Laid-Open PatentApplication 2007-17957, the correcting lens is roughly elliptical inshape, obtained by cutting off two circular sides in parallel. The majoraxis direction of this lens is termed the yaw correction direction, andtwo drive units for driving in the pitch and yaw correction directionsare disposed on one side in the yaw correction direction, and alignedvertically. The coils are disposed such that they are wound around anaxis parallel to the optical axis.

With the lens driving device disclosed in Japanese Laid-Open PatentApplication 2000-194027, a pair of drive units for driving in the pitchcorrection direction and a pair of drive units for driving in the yawcorrection direction are disposed on both sides in the lengthwise andlateral directions of a circular lens to surround the lens on foursides.

With these three patent documents, a guide unit having a guide shaft isused to guide in the pitch correction direction and the yaw correctiondirection, and the lens is guided linearly by a bi-directional guideshaft.

With the lens driving devices discussed in Japanese Laid-Open PatentApplications 2006-243704 and 2007-17957, first and second directiondrive mechanisms are disposed on one side of the lens, so no drivemechanism needs to be disposed in the thickness direction, which allowsthe camera main body to be thinner. However, since drive force isimparted to one side of the lens that is driven, the drive center of thedrive mechanisms ends up being separated from the movable center ofgravity of the portion that moves. Therefore, rotational moment isgenerated in the moving portion, the drive direction is at an angle tothe movement direction with the guide shaft that linearly guides thelens, and a jerky motion tends to result from an increase in slidingresistance. Consequently, the lens driving devices discussed in PatentDocuments 1 and 2 tend not to drive the lens accurately.

With the lens driving device discussed in Japanese Laid-Open PatentApplication 2000-194027, the lens can be driven relatively accuratelybecause both sides of the lens are driven uniformly. However, sincepairs of drive units of the lens driving device are disposed to surroundthe lens on four sides, the size of the lens driving device increases inthe thickness direction of the camera main body, so it is more difficultto reduce the thickness of the camera main body.

SUMMARY

It is an object to reduce the size of an optical element driving devicein the thickness direction of the camera main body, and to be able todrive the optical element accurately.

An optical element driving device according to a first aspect includesat least one optical element, a moving member, a stationary member, afirst direction drive mechanism, and a second direction drive mechanism.The moving member is capable of supporting the optical element. Thestationary member supports the moving member to allow movement in afirst direction and a second direction that intersects the firstdirection. The first direction drive mechanism has first and seconddrive parts provided to the stationary member, and first and seconddriven parts provided to the moving member and capable of moving uponreceipt of drive force from the first and second drive parts, and drivesthe moving member in the first direction. The second direction drivemechanism has a third drive part provided to the stationary member, anda third driven part provided to the moving member and capable of movingupon receipt of drive force form the third drive part, and drives themoving member in the second direction. The first and second driven partsare arranged on opposite sides of the optical element when viewed in athird direction that is perpendicular to the first and seconddirections, and the third driven part is arranged on the same side asthe first driven part with respect to the optical element when viewed inthe third direction.

When this optical element driving device is used to correct image blur,for example, the first direction drive mechanism and the seconddirection drive mechanism are controlled according to the detectionresult of a shake detection sensor, and the moving member supporting theoptical element moves in the first direction and the second direction.With this moving member, the first and second driven parts are arrangedon opposite sides of the optical element, and the third driven part isarranged on the same side as the first driven part with respect to theoptical element.

The “optical element” referred to here encompasses all optical elementsused in imaging optical systems such as, for example, lenses, imagingelements that convert optical images into electrical signals, andprisms, mirrors, and other such bending elements that bend the axis oflight.

Since the first driven part and the second driven part here are arrangedon opposite sides of the optical element, the optical element can bedriven on both sides thereof. Accordingly, even if the drive centers ofthe first and second driven parts should diverge from the center ofgravity of the moving portion, the first driven part and the seconddriven part can be disposed so that the two moments acting on the firstand second driven parts around the center of gravity will cancel eachother out. This allows the optical element to be driven accurately.

Also, since the third driven part is disposed on the first driven partside, the third driven part can be disposed close to the first drivenpart, and this reduces the size in the first direction. Accordingly, ifthe first direction is the thickness direction of the camera main body,the camera main body can be made thinner.

An optical element driving device according to a second aspect is theoptical element driving device of the first aspect, wherein, in themoment around the center of gravity of a portion that includes themoving member, a first moment that acts on the first driven part underthe drive force of the first drive part and a second moment that acts onthe second driven part under the drive force of the second drive partboth act in a direction of canceling each other out.

An optical element driving device according to a third aspect is theoptical element driving device of the second aspect, wherein the firstmoment and the second moment substantially cancel each other out.

An optical element driving device according to a fourth aspect is theoptical element driving device of the second or third aspect, whereinthe drive force of the first drive part is smaller than the drive forceof the second drive part.

An optical element driving device according to a fifth aspect is theoptical element driving device of any of the second to fourth aspects,wherein the third driven part is disposed closer than the first drivenpart to a first imaginary line parallel to the second direction andpassing through the center of gravity.

An optical element driving device according to a sixth aspect is theoptical element driving device of the fifth aspect, wherein the firstand second driven parts are arranged on opposite sides of the firstimaginary line when viewed in the third direction.

An optical element driving device according to a seventh aspect is theoptical element driving device of the sixth aspect, wherein the thirddriven part is disposed aligned with the first driven part in the firstdirection.

An optical element driving device according to an eighth aspect is theoptical element driving device of any of the fifth to seventh aspects,further including a first guide part that is disposed between the centerof gravity and the first driven part in the second direction, and thatguides the moving member in the first direction with respect to thestationary member.

An optical element driving device according to a ninth aspect is theoptical element driving device of the eighth aspect, further including afirst position sensor that is arranged on the same side of the opticalelement as the first driven part, and that detects the position of themoving member in the first direction with respect to the stationarymember.

An optical element driving device according to a tenth aspect is theoptical element driving device of any of the fifth to ninth aspects,wherein the center of gravity overlaps the optical element when viewedin the third direction.

An optical element driving device according to an eleventh aspect is theoptical element driving device of any of the fifth to tenth aspects,wherein the first and second direction drive mechanisms areelectromagnetic linear actuators, the plurality of first to third drivenparts have first to third coils provided to the moving member, and thefirst to third drive parts have first to third magnets provided to thestationary member to be capable of being opposite the first to thirdcoils.

An optical element driving device according to a twelfth aspect is theoptical element driving device of the eleventh aspect, wherein the firstmagnet and the third magnet are formed integrally, the first magnet ismagnetized to a different magnetic pole at a first boundary parallel tothe second direction, and the third magnet is magnetized to a differentmagnetic pole at a third boundary parallel to the first direction.

An optical element driving device according to a thirteenth aspect isthe optical element driving device of the twelfth aspect, wherein thesecond drive part further has a fourth magnet that is magnetized to adifferent magnetic pole at a fourth boundary parallel to the firstdirection and that is provided on the other side with respect to theoptical element, and the second magnet and the fourth magnet are formedintegrally and magnetized to a different magnetic pole at a secondboundary parallel to the second direction the first magnet and thesecond magnet are provided arranged on opposite sides of the firstimaginary line.

An optical element driving device according to a fourteenth aspect isthe optical element driving device of the thirteenth aspect, wherein thesecond direction drive mechanism further has a fourth coil disposedopposite the fourth magnet.

An optical element driving device according to a fifteenth aspect is theoptical element driving device of any of the eighth to fourteenthaspects, further including a second guide part that guides the movingmember in the second direction with respect to the stationary member,wherein the moving member has a first moving frame that is mounted onthe stationary member and is guided in the first direction by the firstguide part, and a second moving frame that has a support part forsupporting the optical element, is mounted on the first moving frame,and is guided in the second direction by the second guide part, and thesecond guide part is disposed on the first moving frame at a positionthat does not overlap the third drive part in the first direction.

An imaging apparatus according to a sixteenth aspect is an imagingapparatus capable of photographing a subject, including an imagingelement, an imaging optical system, an optical element driving device,and a camera main body. The imaging element converts an optical image ofthe subject into an image signal. The imaging optical system includes alens disposed opposite the imaging element, and emits an optical imageof the subject to the imaging element. The optical element drivingdevice is the one according to any of the first to fifteenth aspects,which drives the lens or the imaging element. The camera main bodyhouses the imaging element, the imaging optical system, and the opticalelement driving device.

With this imaging apparatus, an optical image of the subject goesthrough the lens of the imaging optical system and is incident on theimaging element, where it is converted into an electrical signal. If thecamera main body should happen to shake when the image is incident fromthe lens onto the imaging element, this is detected, and as a result theoptical element driving device is driven in a first direction and asecond direction and the image blur is corrected.

BRIEF DESCRIPTION OF DRAWINGS

Referring now to the attached drawings which form a part of thisoriginal disclosure:

FIG. 1 is a simplified oblique view of a digital camera to which anembodiment has been applied, as seen from the front;

FIG. 2 is a simplified oblique view of a digital camera from the rear;

FIG. 3 is a cross sectional schematic of a lens barrel of a digitalcamera;

FIG. 4 is an exploded oblique view of a lens driving device according toan embodiment;

FIG. 5 is an oblique view of a lens driving device;

FIG. 6 is a plan view schematic illustrating the layout of the drivesystem in a lens driving device;

FIG. 7 is a plan view schematic illustrating the moment of a lensdriving device;

FIG. 8 is a plan view schematic illustrating the lens driving device inanother embodiment;

FIG. 9 is a plan view schematic of the lens driving device in yetanother embodiment; and

FIG. 10 is a plan view schematic of the lens driving device in yetanother embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Selected embodiments of the present invention will now be explained withreference to the drawings. It will be apparent to those skilled in theart from this disclosure that the following descriptions of theembodiments of the present invention are provided for illustration onlyand not for the purpose of limiting the invention as defined by theappended claims and their equivalents.

1: Overview of Digital Camera

A digital camera 1 as an example of the imaging apparatus according toan embodiment of the present invention will now be described throughreference to FIGS. 1 and 2. FIGS. 1 and 2 are simplified oblique viewsof the digital camera 1.

The digital camera 1 is a camera for capturing an image of a subject,and has a substantially rectangular camera main body 2. A lens barrel 3having an imaging optical system for bending is installed inside thecamera main body 2 for increasing magnification and reducing the size ofthe camera.

In the following description, the six sides of the digital camera 1 aredefined as follows.

The side facing the subject when an image is being captured by thedigital camera 1 is called the front face of the camera main body 2, andthe face on the opposite side is called the rear face. When an image iscaptured such that the top and bottom in the vertical direction of thesubject match up with the top and bottom in the short-side direction ofthe rectangular image being captured by the digital camera 1 (the aspectratio (the ratio of long to short sides) is generally 3:2, 4:3, 16:9,etc.), the side facing upward in the vertical direction is called thetop face, and the opposite side is called the bottom face. Further, whenthe an image is captured such that the top and bottom in the verticaldirection of the subject match up with the top and bottom in theshort-side direction of the rectangular image being captured by thedigital camera 1, the side that is on the left when viewed from thesubject side is called the left face, and the opposite side is calledthe right face. The above definitions are not intended to limit theusage orientation of the digital camera 1.

Based on the above definitions, FIG. 1 is an oblique view illustratingthe front face, top face, and right face.

The same definitions apply not only to the six sides of the digitalcamera 1, but also to the six sides of the various constituent membersdisposed on the digital camera 1. That is, the above definitions applyto the six sides of the various constituent members in a state in whichthey have been disposed on the digital camera 1.

As shown in FIG. 1, a three-dimensional perpendicular coordinate system(right-hand system) is defined, having a Y axis perpendicular to thefront face of the camera main body 2. Based on this definition, thedirection facing the front face side from the rear face side is calledthe Y axis positive direction, the direction facing the left face sidefrom the right face side is called the X axis positive direction, andthe direction facing the top face side from the bottom face side andperpendicular to the X and Y axes is called the Z axis positivedirection.

The drawings will be described below using this XYZ coordinate system asa reference. That is, the X axis positive side, the Y axis positivedirection, and the Z axis positive direction in the drawings each referto the same respective direction.

2: Overall Configuration of Digital Camera

As shown in FIGS. 1 and 2, the digital camera 1 mainly includes a cameramain body 2 that houses various units, an imaging optical system thatforms an optical image of a subject, and a lens barrel 3 that movablysupports the imaging optical system. As shown in FIG. 3, provided insidethe lens barrel 3 are an image blur correction device 10 for correctingimage blur, and an imaging element 11 that converts optical images intoelectrical signals, such as a CCD (charge coupled device), a CMOS(complementary metal-oxide semiconductor) sensor, or the like.

The imaging optical system is made up of a plurality of lens groups andan optical bending element, and the plurality of lens groups aredisposed in a state of being aligned in a direction that is inclined byan angle α (The angle α is from 0.1 to 6 degrees, for example) from theY and Z axis directions. In FIG. 3, the inclination angle is exaggeratedover the actual angle in order to make the description easier tounderstand. In the following description, the axes inclined by the angleα from the Y and Z axes will be called the Y′ axis and the Z′ axis.

A release button 4, a control dial 5, a power switch 6, and a zoomadjusting lever 7 are provided to the top face of the camera main body 2so that the user can control the imaging operation, etc. The releasebutton 4 is used by the user to input the exposure timing. The controldial 5 is used by the user to make various settings related to imagingoperation. The power switch 6 is used by the user to turn the digitalcamera 1 on or off The zoom adjusting lever 7 is used by the user toadjust the zoom magnification, and is able to rotate around the releasebutton 4 within a specific angular range.

A liquid crystal monitor 8 that displays an image acquired by theimaging element 11 is provided to the rear face of the camera main body2. The liquid crystal monitor 8 is disposed protruding from the rearface of the camera main body 2. Inside the camera main body 2 aredisposed a controller 9 made up of a microprocessor or the like forcontrolling the various operations of the camera, and a removablestorage element 12 for storing an image acquired by the imaging element11.

3: Configuration of Imaging Optical System and Lens Barrel

FIG. 3 is a cross sectional schematic of the configuration of theimaging optical system and the lens barrel 3.

In FIG. 3, the imaging optical system has a first optical system 20which has a first optical axis A1 and guides light from a subject to thecamera main body 2, a bending optical system 22 that is disposed on thefirst optical axis A1 and bends light guided by the first optical system20 in a direction along a second optical axis A2 that is perpendicularto the first optical axis A1, and a second optical system 24 that hasthe second optical axis A2. The imaging element 11 that converts anoptical image of a subject emitted by the second optical system into animage signal is provided on the emitting side of the second opticalsystem 24.

The second optical axis A2 is inclined with respect to the front facesuch that the farther away from the first optical axis A1, the smallerthe distance from the front face of the camera main body 2, and isdisposed along the Z′ axis, which is inclined by the angle α withrespect to the Z axis. The first optical system 20 has a first lensgroup 26 disposed along the first optical axis A1.

The first lens group 26 is, for example, a lens group that overall hasnegative power, and an objective lens that takes in light from thesubject. The bending optical system 22 is, for example, made up of aprism 28 that bends the first optical axis A1 by 90 degrees.

The second optical system 24 has a second lens group 30 disposed closeto the prism 28, and a third lens group 32 disposed between the secondlens group 30 and the imaging element 11. The second lens group 30 is azoom lens group, and has a fixed lens 30 a and a movable lens group 30b. The third lens group 32 is a focus lens group, and has a fixed lens32 a and movable lens groups 32 b and 32 c. Light emitted from the thirdlens group 32 is focused on the imaging element 11 by a lens 34 (anexample of an optical element) disposed opposite the third lens group32.

The lens barrel 3 is a member in the form of a rectangular tube thatsupports the bending optical system 22 and the first and second opticalsystems 20 and 24. The lens barrel 3 has a main body part 13 thatextends along the second optical axis A2, and a protruding part 14 thatextends from the main body part 13 along the first optical axis A1. Thesecond optical system 24 is supported by the main body part 13, and thefirst optical system 20 is supported by the protruding part 14. The mainbody part 13 and protruding part 14 are bent at 90 degrees. In betweenthem is formed an inclined part 15 that supports the bending opticalsystem 22.

4: Configuration of Image Blur Correction Device

The image blur correction device 10 has a shake detection sensor (notshown) featuring a gyro sensor or the like and that detects shake in theyaw direction and pitch direction of the camera main body 2, and a lensdriving device 33 (an example of the optical element driving device)that drives the lens 34 in two directions according to the detectionresult of the shake detection sensor. The lens driving device 33 drivesthe lens 34 in two directions, namely, the X axis positive and negativedirections perpendicular to the second optical axis A2 (an example ofthe second direction; hereinafter referred to as the yaw correctiondirection) to correct this shake according to the signal from the shakedetection sensor, and the Y′ axis positive and negative directions (anexample of the first direction; hereinafter referred to as the pitchcorrection direction).

5: Configuration of Lens Driving Mechanism

FIG. 4 is an exploded oblique view of a lens driving device according toan embodiment of the present invention, and FIG. 5 is an oblique viewthereof.

The lens driving device 33 has the lens 34, a moving member 40 capableof supporting the lens 34, a stationary member 50 that supports themoving member 40 to allow the moving member to move in the pitchcorrection direction and the yaw correction direction, a pitch drivemechanism 60 (an example of the first direction drive mechanism) thatdrives the moving member 40 in the pitch correction direction, and a yawdrive mechanism 70 (an example of the second direction drive mechanism)that drives the moving member in the yaw correction direction. The lensdriving device 33 further includes a pitch guide unit 52 (and example ofthe first guide part) that guides the moving member 40 in the pitchcorrection direction, a yaw guide unit 54 (an example of the secondguide part) that guides the moving member 40 in the yaw direction, apitch position sensor 56 (an example of the first position sensor) thatdetects the position of the moving member 40 with respect to thestationary member 50 in the pitch correction direction, and a yawposition sensor 58 that detects the position of the moving member 40with respect to the stationary member 50 in the yaw correctiondirection.

The stationary member 50 is a rectangular, substantially flat memberthat is fixed inside the lens barrel 3. A circular opening 50 a throughwhich light imaged by the lens 34 can pass is formed in the approximatecenter of the stationary member 50. The opening 50 a may be ellipticalor rectangular. A pair of first support units 50 b for supporting thepitch guide unit 52 are formed protruding upward from the stationarymember 50. The first support units 50 b are disposed spaced apart in theY′ axis direction on a first side (the right side in FIG. 4) in the yawcorrection direction. A rotation limiting protrusion 50 c is formedprotruding upward on the second side in the yaw correction direction andacross from the opening 50 a. The rotation limiting protrusion 50 creceives the load of a pitch movement frame 42 (an example of the firstmoving frame; discussed below) of the moving member 40, and has aC-shaped rotation limiting groove 50 d for limiting the rotation of thepitch movement frame 42 around a pitch guide shaft 52 a (discussedbelow).

The moving member 40 has a pitch movement frame 42 mounted movably inthe pitch correction direction on the stationary member 50, a yawmovement frame 44 (an example of the second moving frame) that ismounted movably in the yaw correction direction on the pitch movementframe 42 and that supports the lens 34, and a coil substrate 46 that isfixed to the yaw movement frame 44.

The pitch movement frame 42 is a member roughly in the form of a flatrectangle that is smaller than the stationary member 50. An ellipticalopening 42 a for transmitting light that passes through the lens 34 isformed in the center of the pitch movement frame 42. The opening 42 amay be circular or rectangular. A guide hole 42 b through which thepitch guide shaft 52 a can pass is formed along the pitch correctiondirection at a first end (the right end in FIG. 4) of the pitch movementframe 42 in the yaw correction direction. A pair of second support units42 c for supporting the yaw guide unit 54 are formed protruding upwardfrom the top face of the pitch movement frame 42. The second supportunits 42 c are disposed to be spaced apart in the yaw correctiondirection on a first side (the front side in FIG. 4) of the pitchmovement frame 42 in the pitch correction direction. A rotation limitingprotrusion 42 d having a rotation limiting shaft 42 e that engages withthe rotation limiting groove 50 d is formed protruding downward from asecond side (the left side in FIG. 4) of the pitch movement frame 42. Asa result, the pitch movement frame 42 is guided in the pitch correctiondirection by the pitch guide unit 52 and the rotation limiting shaft 42e.

A rotation limiting protrusion 42 f is formed protruding upward from asecond side (the back side in FIG. 4) of the pitch movement frame 42 inthe pitch correction direction. The rotation limiting protrusion 42 freceives the load of the yaw movement frame 44 and has a C-shapedrotation limiting shaft 42 g for limiting the rotation of the yawmovement frame 44 around a yaw guide shaft 54 a (discussed below). Thisrotation limiting shaft 42 g engages with the rotation limiting groove50 d, which limits the rotation of the pitch movement frame 42.

The yaw movement frame 44 is a member roughly in the form of a flatrectangle that is smaller than the pitch movement frame 42. A lenssupport unit 44 a that supports the lens 34 is formed in the center ofthe yaw movement frame 44. The lens 34 is roughly elliptical in shape,obtained by cutting off two circular sides in parallel. The major axisdirection of the lens 34 is disposed along the yaw correction direction.

A guide hole 44 b through which the yaw guide shaft 54 a can pass isformed along the yaw correction direction at a first end (the front endin FIG. 4) of the yaw movement frame 44 in the pitch correctiondirection. A rotation limiting protrusion 44 c having a C-shapedrotation limiting groove (not shown) for limiting the rotation of theyaw movement frame 44 around the yaw guide shaft 54 a is formedprotruding rearward in FIG. 4 at a second end (the back end in FIG. 4)of the yaw movement frame 44 in the pitch correction direction. Therotation limiting shaft 42 g engages with this rotation limiting groove.As a result, the yaw movement frame 44 is guided in the yaw correctiondirection by the yaw guide unit 54 and the rotation limiting shaft 42 g.

The coil substrate 46 is a roughly rectangular circuit substrate formounting first and second coils 66 and 68 (examples of the first andsecond driven units; discussed below) constituting the pitch drivemechanism 60, a third coil 76 (an example of the third driven part;discussed below) constituting the yaw drive mechanism 70, and the pitchposition sensor 56 and the yaw position sensor 58. The coil substrate 46is fixed to the yaw movement frame 44 by a suitable fixing means such asadhesive bonding or screws. Rectangular attachment holes 46 a and 46 bfor attaching the pitch position sensor 56 and the yaw position sensor58 are formed in the coil substrate 46. An elliptical first cut-out 46 cfor transmitting light that has been imaged by the lens 34 is formed inthe approximate center portion. Second and third cut-outs 46 d and 46 efor making room for the second support units 42 c are disposed to bespaced apart in the yaw correction direction at a first end (the frontend in FIG. 4) of the coil substrate 46. The second and third cut-outs46 d and 46 e are made larger than the dimensions of the second supportunits 42 c in the yaw correction direction so as not to interfere withthe second support units 42 c when the yaw movement frame 44 moves inthe yaw correction direction. An attachment hole 46 a for attaching thepitch position sensor 56 is formed on the outer side of the secondcut-out 46 d in the yaw correction direction, and an attachment hole 46b for attaching the yaw position sensor 58 is formed on the outer sideof the third cut-out 46 e in the yaw correction direction.

As shown schematically in FIG. 6, the pitch drive mechanism 60 has firstand second magnets 62 and 64 (examples of the first and second driveparts) fixed to the stationary member 50, and first and second coils 66and 68 fixed to the coil substrate 46 at positions that can correspondto the first and second magnets 62 and 64. The yaw drive mechanism 70has a third magnet 72 (an example of the third drive part) fixed to thestationary member 50, and a third coil 76 fixed to the coil substrate 46at a position that can correspond to the third magnet 72.

The first magnet 62 and the third magnet 72 are formed integrally. Also,in this embodiment the second magnet 64 is formed integrally with afourth magnet 74 used not for yaw drive, but for detecting by the yawposition sensor 58. The integrally formed first and third magnets 62 and72 and the second and fourth magnets 64 and 74 are disposed to be spacedapart in the yaw correction direction and arranged on opposite sides ofthe lens 34. Also, as shown in FIGS. 4 and 5, the first and thirdmagnets 62 and 72 and the first and third coils 66 and 76 are covered onthree sides (top, bottom, and outside) by a C-shaped first yoke 80, andthe second and fourth magnets 64 and 74 and the second coil 68 arecovered on three sides (top, bottom, and outside) by a C-shaped secondyoke 82. These two yokes 80 and 82 have the same shape, which reducesthe number of parts that are needed.

As shown in FIG. 6, the first and second magnets 62 and 64 aremagnetized to different magnetic poles at first and second boundaries B1and B2 parallel to the yaw correction direction, and the third andfourth magnets 72 and 74 are magnetized to different magnetic poles atthird and fourth boundaries B3 and B4 parallel to the pitch correctiondirection. More specifically, the inside of the first magnet 62 in thepitch correction direction (the side closer to the third magnet 72) ismagnetized to the N pole, while the outside is magnetized to the S pole.The second magnet 64 is disposed at a diagonally opposite position ofthe coil substrate 46 arranged on opposite sides of the lens 34 and onthe other side from the first magnet 62, that is, arranged on oppositesides of a first imaginary line L1, and similarly the inside ismagnetized to the N pole and the outside to the S pole. The inside ofthe third magnet 72 in the yaw correction direction (the side closer tothe lens 34) is magnetized to the S pole, and the outside is magnetizedto the N pole. The fourth magnet 74 is disposed at a diagonally oppositeposition of the coil substrate 46 arranged on opposite sides of the lens34 and on the other side from the third magnet 72, and similarly theinside is magnetized to the S pole and the outside to the N pole.Disposing these four magnets, 62, 64, 72, and 74 in this way makes itpossible to use magnets in which the structure is the same between amagnet unit in which the first and third magnets 62 and 72 areintegrally formed, and a magnet unit in which the second and fourthmagnets 64 and 74 are integrally formed.

With these two magnet units, the boundary between the first magnet 62(or the second magnet 64) and the third magnet 72 (or the fourth magnet74) is indicated by a two-dot chain line in the drawing, but thisboundary between magnets is only illustrative in nature, and actuallythe first magnet 62 (or the second magnet 64) and the third magnet 72(or the fourth magnet 74) have three magnetic poles formed in a singlemagnet unit. Therefore, the N pole of the first magnet 62 (or the secondmagnet 64) and the N pole of the third magnet 72 (or the fourth magnet74) are simultaneously formed by magnetization in an L-shape.

The first to third coils 66, 68, and 76 are wound with their centerbeing an axis parallel to the second optical axis A2. The first coil 66is fixed to the coil substrate 46 such that when the pitch movementframe 42 and the yaw movement frame 44 are disposed at a referenceposition where the center of the lens 34 is located at the center of thesecond optical axis A1, the center (drive center) is located on thefirst boundary B1. The second coil is fixed to the coil substrate 46such that when the pitch movement frame 42 and the yaw movement frame 44are disposed at a reference position, the center (drive center) islocated on the second boundary B2. The third coil 76 is fixed to thecoil substrate 46 such that when the pitch movement frame 42 and the yawmovement frame 44 are disposed at the reference position, the center islocated on the third boundary B3. When the coil substrate 46 is viewedin the Z′ axis direction (an example of the third direction), that is,from above, the first coil 66 and the second coil 68 are disposedarranged on opposite sides of the lens 34 and spaced apart in the yawcorrection direction. Further, the first coil 66 and the second coil 68are arranged on opposite sides of the first imaginary line L1, whichpasses through the center of gravity G of the portion that moves,including the moving member 40, and is parallel to the yaw correctiondirection.

The center of gravity G of the moving portion referred to here is thecenter of gravity that combines the centers of gravity of the lens 34,the yaw movement frame 44, the coil substrate 46, the first to thirdcoils 66, 68, and 76, the yaw guide unit 54, and the pitch and yawposition sensors 56 and 58, and in this embodiment, the center ofgravity G overlaps the lens 34 when viewed from above (the Z′ axisdirection).

The third coil 76 is arranged on the same side as the first coil 66, andis disposed in the pitch correction direction. Also, the third coil 76is disposed closer to the first imaginary line L1 than the first coil66. The number of windings of the first coil 66 is less than the numberof windings or the winding diameter of the second coil 68, and the driveforce thereof is smaller. Furthermore, as shown in FIG. 7, the positionsof the first coil 66 and the second coil 68 are determined so that, inthe moment around the center of gravity G of the moving portion, a firstmoment that acts on the first coil 66 under the drive force of the firstmagnet 62 (FIG. 6) (that is, the product of the drive force acting onthe center of the first coil 66 (the scalar value of a drive vector F1)and the distance D1 between the center of gravity G and the center ofthe first coil 66 in a direction perpendicular to the drive vector F1)and a second moment that acts on the second coil under the drive forceof the second coil 68 (that is, the product of the drive force acting onthe center of the second coil 68 (the scalar value of a drive vector F2)and the distance D2 between the center of gravity G and the center ofthe second coil 68 in a direction perpendicular to the drive vector F2)substantially cancel each other out. The meaning of the phrase “thefirst moment and the second moment substantially cancel each other out”here includes not only that the two moments completely cancel each otherout, but also that they are canceled out to the extent that they do notaffect the movement of the pitch movement frame 42 by the first andsecond coils 66 and 68.

When the two coils 66 and 68 are disposed in these positions, near thecenter of gravity G a combined drive vector FA, which is a combinationof the drive vectors F1 and F2 acting on the first coil 66 and thesecond coil 68, faces in the pitch correction direction.

As shown in FIGS. 4 and 6, the pitch guide unit 52 guides the pitchmovement frame 42 of the moving member 40 in the pitch correctiondirection with respect to the stationary member 50. The pitch guide unit52 is arranged on the same side as the first magnet 62 in the yawcorrect direction. The pitch guide unit 52 has the pitch guide shaft 52a, the ends of which are supported by the pair of first support units 50b. Therefore, the pitch guide shaft 52 a is disposed along the pitchcorrection direction between the lens 34 and the first magnet 62. Thepitch guide shaft 52 a is fixed by a suitable fixing means, such asadhesive bonding, to the pair of first support units 50 b.

The yaw guide unit 54 guides the yaw movement frame 44 of the movingmember 40 in the yaw correction direction. The yaw guide unit 54 isdisposed on the pitch movement frame 42 at a position that does notoverlap with the third magnet 72 in the pitch correction direction. Morespecifically, the yaw guide unit 54 has the yaw guide shaft 54 a, theends of which are supported by the pair of second support units 42 c ofthe pitch movement frame 42. Therefore, the yaw guide shaft 54 a isdisposed along the yaw correction direction more to the front side inFIG. 4 than the lens 34. The yaw guide shaft 52 a is fixed by a suitablefixing means, such as adhesive bonding, to the pair of second supportunits 42 c.

The pitch position sensor 56 makes use, for example, of a magneticsensor capable of detecting the relative position with respect to thefirst magnet 62. As shown in FIG. 6, the pitch position sensor 56 isarranged on the same side as the first magnet 62 with respect to thelens 34. More specifically, the pitch position sensor 56 is disposedbetween the pitch guide unit 52 and the first coil 66 so that its centeris located at the first boundary B1 of the first magnet 62. Therefore,the first magnet 62 functions as a drive unit for the lens 34 and alsofunctions to detect the position of the pitch movement frame 42, and isshared by the first coil 66 and the pitch position sensor 56.

The yaw position sensor 58 makes use, for example, of a magnetic sensorcapable of detecting the relative position with respect to the fourthmagnet 74. As shown in FIG. 6, the yaw position sensor 58 is disposed onthe opposite side from the pitch position sensor 56 with respect to thelens 34. More specifically, the yaw position sensor 58 has its centerlocated at the fourth boundary B4 of the fourth magnet 74, and isdisposed closer to the yaw guide unit 54.

6: Operation of Lens Driving Mechanism

The lens driving device 33 is controlled according to the output from ashake detection sensor. When shake caused by hand shake or the like isdetected in the pitch or yaw direction of the camera main body 2,current corresponding to the detection result from the shake detectionsensor is sent from the controller 9 to the first to third coils 66, 68,and 76, and the lens 34 is driven in the pitch correction direction andthe yaw correction direction to eliminate image blur caused by shake.

When current is supplied in a specific direction to the third coil 76,an electromagnetic force expressed by a drive vector F3 in FIG. 7, forexample, is generated, and the yaw movement frame 44, including the lens34, moves from the reference position along the yaw guide unit 54.Meanwhile, when current is supplied in a specific directionsimultaneously to the first and second coils 66 and 68, electromagneticforces expressed, for example, by the drive vector FT and the drivevector F2, respectively, are generated, and the lens 34, the yaw guideunit 54, the yaw movement frame 44, and the pitch movement frame 42 moveintegrally along the pitch guide unit 52. When current is supplied inthe opposite direction, the pitch movement frame 42 and the yaw movementframe 44 move the opposite way in the pitch correction direction and theyaw correction direction.

Here, because the third coil 76 is disposed such that the center ofgravity G is near an extension line of the drive vector F3 of the thirdcoil 76, the rotational moment imparted to the portion moving in the yawcorrection direction is reduced. This allows the sliding resistancegenerated by the yaw guide unit 54 to be reduced and the lens 34 to bedriven very accurately in the yaw correction direction.

Meanwhile, since the first and second coils 66 and 68 are disposed suchthat the center of gravity G is on an extension line of the combineddrive vector FA, which is a combination of the drive vector F1 of thefirst coil 66 and the drive vector F2 of the second coil 68, lessrotational moment is imparted to the moving portion, the slidingresistance generated by the pitch guide unit 52 is reduced, and the lens34 can be driven very accurately in the pitch correction direction.

7: Effect of the Embodiment

7.1

Since the first coil 66 and the second coil 68 are arranged on oppositesides of the lens 34 as the driven units of the pitch drive mechanism60, the lens 34 can be driven on both sides thereof. Accordingly, evenif the drive centers of the first and second coils 66 and 68 shoulddiverge from the center of gravity G of the moving portion, the firstcoil 66 and the second coil 68 can be disposed so that the two momentsacting on the first and second coils 66 and 68 around the center ofgravity G will cancel each other out. This allows the lens 34 to bedriven accurately.

Also, since the third coil 76 is arranged on the same side as the firstcoil 66, the third coil 76 can be disposed close to the first coil 66,and this reduces the size in the pitch correction direction.Accordingly, if the pitch correction direction is the thicknessdirection of the camera main body 2, the camera main body 2 can be madethinner.

In particular, with a lens barrel 3 in which a bending optical system isused, since constituent members such as a focus or zoom actuator aredisposed on both sides of the optical system in the yaw correctiondirection, with the lens driving device 33, the size of the lens barrel3 in its thickness direction can be reduced by disposing the first andsecond coils 66 and 68 that drive the lens 34 in the pitch correctiondirection on both sides of the lens 34 in the yaw correction direction.

7.2

Since the first moment acting on the first coil 66 and the second momentacting on the second coil 68 act in directions that substantially canceleach other out, near the center of gravity G the combined drive vectorfor the two coils 66 and 68 tends to face in the pitch correctiondirection. Accordingly, the lens 34 tends to be driven more accuratelyin the correction direction.

7.3

Because the first moment acting on the first coil 66 and the secondmoment acting on the second coil 68 substantially cancel each other out,the combined drive vector FA of the two coils 66 and 68 act in the samepitch correction direction near the center of gravity G. Accordingly, itis less likely that a jerky motion will result from an increase insliding resistance, and the lens 34 can be driven even more accuratelyin the pitch correction direction.

7.4

Since the drive force of the first coil 66 is smaller than the driveforce of the second coil 68, the first coil 66 can be smaller in sizethan the second coil 68. Accordingly, the overall size can be reducedeven if the first coil 66 is disposed aligned with the third coil 76.Also, if the first coil 66 is disposed farther away from the center ofgravity G than the second coil 68, the layout can be such that themoments around the center of gravity substantially cancel each otherout, and the pitch guide unit 52 that guides the moving member 40 can bedisposed more easily between the lens 34 and the first coil.

7.5

The third coil 76 is disposed closer to the first imaginary line L1 thanthe first coil 66. Accordingly, the center of gravity G can be disposedclose to an extension line of the drive vector F3 of the third coil 76for driving the yaw movement frame 44 in the yaw correction direction,the moment around the center of gravity is smaller, and the lens 34 canbe driven accurately even in the yaw correction direction.

7.6

When viewed from above, the first and second coils 66 and 68 areprovided arranged on opposite sides of the first imaginary line L1. Inthis case, since the first and second coils 66 and 68 are disposed onboth sides of the first imaginary line L1, the moving member 40 hasbetter weight balance, the center of gravity G can be moved more to thelens 34 side, and the lens driving device 33 can be efficiently disposedin the space within the camera main body 2.

7.7

Since the first coil 66 and the third coil 76 are disposed aligned inthe pitch correction direction, the lens driving device 33 can besmaller in the yaw correction direction.

7.8

Since the pitch guide unit 52 that guides the moving member 40 in thepitch correction direction is disposed between the center of gravity Gand the first coil 66 for moving the moving member 40 in the pitchcorrection direction, the center of gravity G can be disposed more tothe pitch guide unit 52 side than the first coil 66. Accordingly,jerkiness produced by sliding resistance generated in the pitch guideunit 52 can be reduced, and the lens 34 driven more accurately.

7.9

Since the pitch position sensor 56 that detects the position of themoving member 40 in the pitch correction direction with respect to thestationary member 50 is arranged on the same side as the first coil 66with respect to the lens 34, the pitch position sensor is disposed closeto the pitch guide unit 52. Accordingly, the pitch position sensor 56can move more smoothly, and the detection accuracy of the pitch positionsensor 56 can be stabilized.

Also, since the pitch position sensor 56 is disposed near the first coil66, the first magnet 62 can also be used for position detection, meaningthat the first magnet 62 can serve both for drive and for detection,which reduces the number of parts required.

7.10

When viewed from above, the center of gravity G overlaps the lens 34, sothere is less fluctuation in the size of the first coil 66 and thesecond coil 68, and less protrusion in the yaw correction direction.

7.11

The lens 34 can be driven quietly, quickly, and accurately by a linearactuator made up of the magnets 62, 64, and 72 and the coils 66, 68, and76. Also, since the coils 66, 68, and 76, which are lighter in weightthan the magnets 62, 64, and 62, are provided to the moving member 40,the moving portion can be more lightweight, which reduces powerconsumption.

7.12

The first magnet 62 and the third magnet 72 are integrally formed, thefirst magnet 62 is magnetized to a different magnetic pole at a firstboundary B1 parallel to the yaw correction direction, and the thirdmagnet 72 is magnetized to a different magnetic pole are arranged onopposite sides of the third boundary B3 parallel to the pitch correctiondirection, so the first and third coils 66 and 72 can be moved in thepitch correction direction and the yaw correction direction are arrangedon opposite sides of the first boundary B1 and the third boundary B3,respectively. Also, if a magnet the same as one obtained by integrallyforming the first and third magnets 62 and 72 is disposed to be rotatedto the opposite side of the lens 34, the portion where the first magnet62 is formed can be used as the second magnet 64. Accordingly, themagnets are shared in the lens driving device 33, and this reduces thecost.

7.13

When there is further provided a fourth magnet 74, which is magnetizedto a different pole at the fourth boundary B4 parallel to the pitchcorrection direction, and is provided on the other side with respect tothe lens 34, and when the first magnet 62 and the second magnet 64 arearranged on opposite sides of the first imaginary line L1, the fourthmagnet 74 does not function as a drive unit, but magnets can be used inwhich the structure is exactly the same between a magnet in which thefirst and third magnets 62 and 72 are integrally formed, and a magnet inwhich the second and fourth magnets 64 and 74 are integrally formed.This allows the magnets to be shared and lowers the cost.

7.14

Since the yaw guide unit 54 is provided for guiding the yaw movementframe 44, and the yaw guide unit 54 is disposed so as not to overlapwith the third coil 76 in the pitch correction direction, the center ofgravity G can be closer to the third coil 76, and the lens 34 can bedriven even more accurately in the yaw correction direction.

8: Other Embodiments

The lens driving mechanism according to the present invention is notlimited to the embodiment given above, and various changes andmodifications are possible without departing from the gist of thepresent invention.

(8.1)

As shown in FIG. 8, a pitch position sensor 156 may be disposed at thesecond boundary B2 of the second magnet 64. In this case, since thepitch position sensor 156 and the yaw position sensor 58 are arranged onthe same side with respect to the lens 34, wiring to the sensors 156 and58 can be installed more easily. The rest of the constitution is thesame as that in the above embodiment, and will therefore not bedescribed again.

(8.2)

As shown in FIG. 9, in a pitch drive mechanism 160 and a yaw drivemechanism 170, the size of a magnet unit on the right side of first andsecond magnets 162 and 172 arranged on opposite sides of the lens 34 maybe different from that of a magnet unit on the left side of second andfourth magnets 164 and 174. In FIG. 9, the magnet unit of the firstmagnet 162 and the third magnet 172 on the right side of the pitch guideunit 52 is larger in size than the magnet unit of the second magnet 164and the fourth magnet 174 on the left side, and a first coil 166 islarger than a second coil 168. In this case, the position of the centerof gravity G moves toward the larger magnet unit on the right side, andthe center of gravity G is located closer to the pitch guide unit 52.Here again, the first and second coils 166 and 168 are disposed so thatthe first and second moments will cancel each other out.

When the sizes on both sides of the lens 34 are thus made different, itis more difficult for parts to be shared, but since the center ofgravity G and the combined drive vector are closer to the pitch guideunit 52 side, less sliding resistance will be generated at the pitchguide unit 52, +s the lens 34 can be driven more accurately.

(8.3)

As shown in FIG. 10, a fourth coil 278 may be disposed on the coilsubstrate 46 opposite the fourth magnet 68, and two coils 276 and 278may be provided to a yaw drive mechanism 270. The fourth coil 278 isdisposed so that its center is located at the fourth boundary B4 of thefourth magnet 74. The rest of the constitution is the same as that inthe above embodiment, and will therefore not be described again.

In this case, not only with the pitch drive mechanism 60, but also withthe yaw drive mechanism 270, the fourth coil 278 is disposed as a fourthdriven unit on the second coil 68 side arranged on opposite sides of thelens 34, and the moving member 40 can be driven by two magnets and coilson both sides of the lens 34, so the thickness is reduced and the lenscan be driven even more accurately in the yaw correction direction aswell.

Furthermore, in this case again, the positions of a third coil 276 andthe fourth coil 278 are determined so that, in the moment around thecenter of gravity G of the moving portion, a third moment that acts onthe third coil 276 under the drive force of the third magnet 72 (FIG. 6)(that is, the product of the drive force acting on the center of thethird coil 276 (the scalar value of a drive vector F3) and the distanceD3 between the center of gravity G and the center of the third coil 276)and a fourth moment that acts on the fourth coil 278 under the driveforce of the fourth coil 278 (that is, the product of the drive forceacting on the center of the fourth coil 278 (the scalar value of a drivevector F4) and the distance D4 between the center of gravity G and thecenter of the fourth coil 278) substantially cancel each other out.

(8.4)

In the above embodiment, a linear actuator including magnets and coilsis used as the pitch and yoke drive mechanism, but the present inventionis not limited to this. For example, a stepping motor, a lead screw, orthe like may be used for linear drive, or a piezoelectric element or thelike may be used.

(8.5)

In the above embodiment, two coils are provided for pitch drive, but thenumber of coils is not limited to two, and may be any number greaterthan or equal to two. In this case, the number of magnetic poles isdetermined according to the number of coils.

(8.6)

In the above embodiment, C-shaped first and second yokes 80 and 82having the same shape are provided to form the magnetic circuit moreefficiently, but if an adequate magnetic circuit can be formed withmagnets alone, the yokes need not be provided. Also, the first andsecond yokes may be constituted by a first portion disposed on thebottom face of the magnet and a second portion disposed on the top faceof the magnet, and may have a separated configuration in which noconnecting portion is provided for connecting the two portions. In thiscase, not providing the connecting portion affords a correspondingreduction in the size in the yaw correction direction.

(8.7)

In the above embodiment, the pitch movement frame 42 and the yawmovement frame 44 are guided by shafts in the pitch and yaw guide units52 and 54, but guide units that make use of balls may be used instead.However, a guide unit that makes use of a guide shaft is easier toassemble and allows the movement frame to be guided stably both in thepitch correction direction and in the yaw correction direction.

(8.8)

In the above embodiment, the lens 34 is driven as an optical element,but the constitution may instead be such that the imaging element 11 isdriven. Also, the reflecting mirror of prism of a bending optical systemmay be driven.

(8.9)

In the above embodiment, the lens barrel 3 and the second optical system24 are disposed at an angle to the front face of the camera main body 2,which reduced the thickness of the lens barrel 3 in addition to that ofthe lens driving device 33, and further reduced the thickness of thecamera main body 2. However, the lens driving device and imagingapparatus according to the present invention are not limited to havingan inclined lens barrel and second optical system, and the lens barreland the second optical system may instead be disposed parallel to thefront face of the camera main body.

(8.10)

In the above embodiment, the drive force is varied with the size of thecoils when two coils are provided to the pitch and yaw drive mechanisms,but the drive force may instead be varied by varying the current that isapplied to the coils.

GENERAL INTERPRETATION OF TERMS

In understanding the scope of the present invention, the term“configured” as used herein to describe a component, section, or part ofa device includes hardware and/or software that is constructed and/orprogrammed to carry out the desired function.

In understanding the scope of the present invention, the term“comprising” and its derivatives, as used herein, are intended to beopen ended terms that specify the presence of the stated features,elements, components, groups, integers, and/or steps, but do not excludethe presence of other unstated features, elements, components, groups,integers and/or steps. The foregoing also applies to words havingsimilar meanings such as the terms “including,” “having,” and theirderivatives. Also, the terms “part,” “section,” “portion,” “member,” or“element” when used in the singular can have the dual meaning of asingle part or a plurality of parts.

Terms that are expressed as “means-plus function” in the claims shouldinclude any structure that can be utilized to carry out the function ofthat part of the present invention. Finally, terms of degree such as“substantially,” “about,” and “approximately” as used herein mean areasonable amount of deviation of the modified term such that the endresult is not significantly changed.

While only selected embodiments have been chosen to illustrate thepresent invention, it will be apparent to those skilled in the art fromthis disclosure that various changes and modifications can be madeherein without departing from the scope of the invention as defined inthe appended claims. Furthermore, the foregoing descriptions of theembodiments according to the present invention are provided forillustration only, and not for the purpose of limiting the invention asdefined by the appended claims and their equivalents. Thus, the scope ofthe invention is not limited to the disclosed embodiments.

1. An optical element driving device comprising: at least one opticalelement; a moving member configured to support the optical element; astationary member configured to support the moving member to be movablein a first direction and a second direction intersecting the firstdirection; a first direction drive mechanism having first and seconddrive parts provided to the stationary member, and first and seconddriven parts provided to the moving member and movable upon receiving adrive force from the first and second drive parts, and the firstdirection drive mechanism configured to drive the moving member in thefirst direction; and a second direction drive mechanism having a thirddrive part provided to the stationary member, and a third driven partprovided to the moving member and movable upon receiving a drive forceform the third drive part, and the second direction drive mechanismconfigured to drive the moving member in the second direction, the firstand second driven parts arranged on opposite sides of the opticalelement when viewed in a third direction perpendicular to the first andsecond directions, and the third driven part arranged on the same sideof the optical element as the first driven part when viewed in the thirddirection.
 2. The optical element driving device according to claim 1,wherein, near a center of gravity of a portion of the optical elementdriving device that moves including the moving member a first momentthat acts on the first driven part upon receiving the drive force of thefirst drive part and a second moment that acts on the second driven partupon receiving the drive force of the second drive part both act tosubstantially cancel each other out.
 3. The optical element drivingdevice according to claim 2, wherein the first moment and the secondmoment completely cancel each other out.
 4. The optical element drivingdevice according to claim 3, wherein the drive force of the first drivepart is smaller than the drive force of the second drive part.
 5. Theoptical element driving device according to claim 4, wherein the thirddriven part is disposed closer than the first driven part to a firstimaginary line parallel to the second direction and passing through thecenter of gravity.
 6. The optical element driving device according toclaim 5, wherein the first and second driven parts are provided onopposite sides of the first imaginary line when viewed in the thirddirection.
 7. The optical element driving device according to claim 6,wherein the third driven part is disposed to be aligned with the firstdriven part in the first direction.
 8. The optical element drivingdevice according to claim 7, further comprising a first guide partdisposed between the center of gravity and the first driven part in thesecond direction, and configured to guide the moving member in the firstdirection with respect to the stationary member.
 9. The optical elementdriving device according to claim 8, further comprising a first positionsensor arranged on the same side of the optical element as the firstdriven part, and configured to detect the position of the moving memberin the first direction with respect to the stationary member.
 10. Theoptical element driving device according to claim 9, wherein the centerof gravity overlaps the optical element when viewed in the thirddirection.
 11. The optical element driving device according to claim 10,wherein the first and second direction drive mechanisms areelectromagnetic linear actuators, the first, second and third drivenparts have first, second and third coils provided to the moving member,respectively, and the first, second and third drive parts have first,second and third magnets provided to the stationary member to be capableof being disposed opposite to the first, second and third coils,respectively.
 12. The optical element driving device according to claim11, wherein the first magnet and the third magnet are formed integrally,the first magnet is magnetized to different magnetic poles at a firstboundary parallel to the second direction, and the third magnet ismagnetized to different magnetic poles at a third boundary parallel tothe first direction.
 13. The optical element driving device according toclaim 12, wherein the second drive part further has a fourth magnet thatis magnetized to different magnetic poles at a fourth boundary parallelto the first direction, and that is provided on the other side of theoptical element than the third magnet, the second magnet and the fourthmagnet are formed integrally, the second magnet is magnetized todifferent magnet poles at a second boundary parallel to the seconddirection and the fourth magnet is magnetized to different magneticpoles at a fourth boundary parallel to the first direction, and thefirst magnet and the second magnet are provided on opposite sides of thefirst imaginary line.
 14. The optical element driving device accordingto claim 13, wherein the second direction drive mechanism further has afourth coil disposed opposite the fourth magnet.
 15. The optical elementdriving device according to claim 14, further comprising a second guidepart configured to guide the moving member in the second direction withrespect to the stationary member, wherein the moving member has: a firstmoving frame that is mounted on the stationary member and is guided inthe first direction by the first guide part, and a second moving framehaving a support part supporting the optical element, the second movingframe is mounted on the first moving frame and is guided in the seconddirection by the second guide part, and the second guide part isdisposed on the first moving frame at a position that does not overlapthe third drive part in the first direction.
 16. The optical elementdriving device according to claim 1, wherein the drive force of thefirst drive part is smaller than the drive force of the second drivepart.
 17. The optical element driving device according to claim 1,wherein the third driven part is disposed closer than the first drivenpart to a first imaginary line parallel to the second direction andpassing through the center of gravity.
 18. The optical element drivingdevice according to claim 1, wherein the first and second driven partsare provided on opposite sides of the first imaginary line when viewedin the third direction.
 19. The optical element driving device accordingto claim 1, wherein the third driven part is disposed to be aligned withthe first driven part in the first direction.
 20. An imaging apparatuscapable of photographing a subject, the imaging apparatus comprising: animaging element configured to convert an optical image of the subjectinto an image signal; an imaging optical system including a lensdisposed opposite to the imaging element and configured to emit anoptical image of the subject to the imaging element; an optical imagedriving device configured to drive either the lens or the imagingelement; and a main body configured to house the imaging element, theimaging optical system and the optical element driving device; whereinthe optical image driving device includes: a moving member configured tosupport either the lens or the imaging element; a stationary memberconfigured to support the moving member to be movable in a firstdirection and a second direction intersecting the first direction; afirst direction drive mechanism having first and second drive partsprovided to the stationary member, and first and second driven partsprovided to the moving member and movable upon receiving a drive forcefrom the first and second drive parts, and the first direction drivemechanism configured to drive the moving member in the first direction;and a second direction drive mechanism having a third drive partprovided to the stationary member, and a third driven part provided tothe moving member and movable upon receiving a drive force form thethird drive part, and the second direction drive mechanism configured todrive the moving member in the second direction, the first and seconddriven parts arranged on opposite sides of the optical element whenviewed in a third direction perpendicular to the first and seconddirections, and the third driven part arranged on the same side of theoptical element as the first driven part when viewed in the thirddirection.